[UK-CONTEST] Voice Keyer

[Cooper, Stewart]

OK on all the comments about RF feedback. After a bit of investigation, my
RF feedback appears to come, not from the MJF voice keyer itself, as I had
thought, but from the Heil headset, when it is plugged in to the DX Doubler.
If I unplug the mic input (which comes from the DX Doubler) into the MFJ the
problem goes, but it also goes if I unplug the headset from the DX Doubler.
This is probably getting nearer to the solution. I do use a small ferrite
toroid on the mic, but it obviously doesn't do the job.
It's worth noting that the reason a battery is recommended for use with the
MFJ is because RF gets in through the supply line. Nothing directly to do
with increasing the supply 'resilience'.
All said and done, I may ditch CT and try Writelog with a sound card. But I
may still get RF in through the DX Doubler or Heil. I will only find out by
trying it.
(Oh help. I'm suggesting the use of Windows as a shack operating system!)

73
Stewart
GM4AFF
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